jones



W- O. JONES April 14, 1964 MEANS AND METHOD FOR FORMING COILS OFSTRIP-LIKE MATERIAL 3 Sheets-Sheet 1 Filed April 20, 1959 INVENTOR.

Walter 0. Jones April 14, 1964 w. o. JONES 3,128,960

MEANS AND METHOD FOR FORMING COIL-S OF STRIP-LIKE MATERIAL Filed April20, 1959 3 Sheets-Sheet 2 Fig.2.

pwwzey April 14, 1964 w. o. JONES 3,128,960

MEANS AND METHOD FOR FORMING COILS 0F STRIP-LIKE MATERIAL Filed April20, 1959 v 5 Sheets-Sheet 5 Fig.4.

INVENTOR.

Walter 0. Jones United States Patent 3,128,960 MEANS AND METHQD FURFORMING COIL 0F ST-LIKE MATERIAL Walter 0. Jones, Warren, Ohio, assignorto The Wean Engineering Company, Inc., Warren, Ohio, 21 corporation ofOhio Filed Apr. 20, 1959, Ser. No. 807,672 13 Claims. (Cl. 242-785) Thisinvention relates to belt wrappers in which belt means are employed todirect strip-like material about a winding member for winding coilsthereon.

The formation of coils by the use of belt wrappers is well known in thehandling of steel strip, for example. The conventional practice inhandling extended lengths of such strip has been to wrap or coil asingle length of strip material to form a single coil. A belt wrapper isplaced in position to guide the leading end of the strip around thecircumference of a winding man drel a suflicient distance for the stripto be repetitively coiled upon the mandrel by further rotation. Theoperator frequently guides the strip manually until the first wrap ismade. After a few wraps, the frictional force developed by the windingmotion of the mandrel and the back tension of the strip is sufiicientlylarge to cinch the strip, and the belt wrapper is immediately disengagedand moved to inoperative position. The coil is then wound until theentire length of strip has been piaced thereon. In some instances,multiple lengths of mill length strip are welded together end to end forcoiling, and in other cases, the strip may be cut when a coil has beenwound to the largest manageable size. The emphasis throughout the arthas been in handling coils and strips of the longest possible length andof building up shorter lengths of strip into a longer continuous lengthby welding end to end.

Such a practice has been followed in mill handling of the strip and indelivery to the customer. In some instances, however, the coiled stripis subjected to further operation at the mill in which it is cut tosized lengths. Such practice has commonly been followed, for example,with strip which has been electrolytically plated with tin, as well aswith hot dipped tin sheets and other sheet products. Electrolytic tinplate is plated in continuous lengths, and the plated strip isconventionally cut to sheet lengths at the mill for shipment to canmanufacturers in sheet form. The continuous plated strip hasconventionally been inspected for defects and cut into sheet lengths.The sheets are then passed through a sheet classifier in which sheetscut from defective lengths of strip are set aside for salvage or thelike. A single defect in a sheet requires rejection of the sheet, andthere has been an attendant wastage of prime material by reason of itsinclusion in a sheet having one or more defects.

It has recently been proposed to manufacture cans from electrolyticallyplated strip material rather than from sheet material, thereby avoidingthe intermediate handling. The plated strip, however, includes defects,and sections having such defects must be excluded from can makingmachines. Can manufacturers have not heretofore possessed the equipmentto inspect the strip for defects and are not desirous of acquiring suchequipment. They, therefore, wish to have strip supplied to them which isentirely free of defects. If the strip is cut at the mill to removedefective portions but is not otherwise cut into sheet lengths, randomlengths of plated strip material are produced.

Such strips are most conveniently handled in coil form but the problemsof forming a coil of discontinuous random lengths have made it difficultto supply strip in this 3,128,960 Patented Apr. 14, 1964 form withoutexcessive labor costs and handling difficulties.

I have devised new and useful ways of overcoming such dificulties and ofsupplying random length striplike material in readily manageable form. Iprovide belt Wrapper apparatus comprising a support member, a pair ofprimary belt guiding frames supported therefrom, belt means trainedabout the belt guiding frames, and means to urge the primary beltguiding frames toward and away from a coiling mandrel. I preferablyprovide a pair of secondary belt guiding frames, and means urging one ofsaid belt guiding frames away from the mandrel, whereby the belt ismaintained in tension. I further preferaby provide a pair of suchsupport members on opposite sides of the mandrel and means to shift saidsupport members toward and away from the mandrel. 1 preferably provide afirst primary belt guiding frame pivotally supported from the supportmember for movement toward and away from the mandrel, a first secondarybelt guiding frame associated therewith and arranged for movement towardand away from the mandrel, means connecting said belt guiding frames formovement of one toward and away from the mandrel oppositely to suchmovement of the other. I further preferably provide a second primarybelt guiding frame, link means supporting the second primary beltguiding frame from the support for substantially radial movement of theextremity thereof relative to the mandrel, a second secondary beltguiding frame, and means urging the second secondary belt guiding frameupwardly, whereby a belt trained about all of said belt guiding framesis maintained in tension.

Other details, objects and advantages of my invention will becomeapparent as the following description of a present preferred embodimentthereof proceeds.

In the accompanying drawings, I have illustrated a present preferredembodiment of the invention in which FIGURE 1 is a side elevational viewof the belt wrapper in operating position showing a full coil wound onthe mandrel;

FIGURE 2 is a side elevational view of part of the belt wrapper ofFIGURE 1 in retracted position and having a portion of the frameremoved;

FIGURE 3 is an end view of the apparatus shown in FIGURE 2;

FIGURE 4 is a sectional view taken along line IVIV of FIGURE 1; and

FIGURE 5 is a plan view of the apparatus shown in FIGURE 4.

Referring now to the drawings and initially to FIG- URES 1 and 3, basemembers 10 are disposed on opposite sides of a mandrel 11 on which stripmaterial I is adapted to be wound. Mandrel 11 may comprise a collapsiblecylindrical member supported from an offset base and driven by anelectric motor. The mandrel may be expandible for winding and may thenbe contracted to smaller diameter for removal of a coil therefrom.Support members or frames 12 are slidably placed on base members It Theyare formed of parallel side plates 13 and I4- vertically disposed andconnected to each other by spaced crossbars 15, 16 and 17, the bars andplates being Welded together to form a rigid structure. Plates 13 arerigidly engaged to the base of each frame I2, and guide bars 19 in rigidengagement therewith extend downwardly. Guide bars 19 interlock with andslidably engage slide plates 29 which are fixed to the upper portion ofeach base member It). The interlocking engagement of guides 19 andplates 20 prevents frames 12 from movement on the associated base memberexcept slidably along the length of the base member. Bearing plates 21are attached to the lower side of plates 18 for sliding movement onplates 20. Bottom plate 22 is welded between plates 18 and adds rigidityto frame 12. A bracket 23 is welded to the underside thereof. A pistonrod 24 terminates in a clevis 26 which is fastened to bracket 23 by apin 25. The other end of piston rod 24 is fastened to a double actingpiston in a cylinder 27 which is anchored to base support 10. Compressedair or hydraulic fluid is selectively supplied to either end throughnecessary valves and connecting piping which have been omitted from thedrawings for clarity of illustration.

An upper primary belt guiding frame is supported from each frame 12. Itcomprises a pair of extending major arms 28, a crossbar 29 to which arms23 are Welded, and a crossbar 30. Crossbar 29 is rotatably journaled inside plates 13 and 14 of frame 12. Crossbar 3% extends between theextremities of arms 28 and has a tapered selfcentering belt pulley 31rotatably mounted thereon. Two bars 32 are welded to crossbar 29 side byside and form an extension of the belt guiding frame. A spur gear 33 isfixed on bar 29. An upper secondary belt guiding frame is formed ofextending minor arms 34, crossbar 35 rotatably journaled in side plates13 and 14, and a crossbar 36 extending between the extremities of minorarms 34. A belt pulley 37 of the same type heretofore described isrotatably mounted on crossbar 36. A gear 38 is fixed on crossbar 35 andmeshes with gear 33.

A lower primary belt guiding frame is formed from major arms 39, acrossbar 4t and a crossbar 41, extending between the extremities ofmajor arms 39. A belt pulley 42 of the same type is rotatably mounted oncrossbar 41. A bar 43 is welded to crossbar 43 as a unitary part of thelower primary belt guiding frame. Crossbar 4b is journaled for rotationin two vertically positioned links 44 and 45 which are welded to acrossbar 46 journaled for rotation in side plates 13 and 14. Links 44and 45 are thus free to rotate pivotally together as a unit about theaxis of cross-bar 46. A link 47 is pivotally connected to the end of bar43 at pivot point 48. The other end of link 47 is pivotally connected atpivot point 49 to a fitting 50 which is bolted to side wall 14. Abracket 51 is welded to crossbar 4t) and thereby becomes a part of theunitary structure forming the lower primary belt guiding frame. Acrossbar 52 is rotatably mounted in the ends of links 44 and 45' whichare opposite from crossbar 46. Lower minor arms 53 are welded theretoand have a crossbar 54 extending therebetween, thereby forming a lowersecondary belt guiding frame. A self-centerin g belt pulley 55 isrotatably mounted on crossbar 54. A bracket 56 is welded to and projectsfrom crossbar 52, thereby becoming a unitary part of the lower secondarybelt guiding frame. A rod 57 is pivotally connected thereto by pin 58.The upper end of rod 57 extends through a coil spring 59 and terminatesin lock nuts 60 and washer 61. The spring is compressed between washer61 and a seat 62 resting in a saddle 63 which is welded to and projectsfrom crossbar 40.

A double-acting fluid power cylinder 64 is placed intermediate extensionbars 32 and bracket 51, and the fluid supply connections have beenomitted from the drawings for clarity of illustration. The cylinder ispivotally connected to bracket 51 by a pin 65. The end of the associatedpiston rod 66 is attached to extension bars 32 by a pin 67.

A single belt 63 is trained about the belt pulleys 31, 37, 55 and 42supported from each frame 12. I use the term single belt as broadlydescriptive of belt means extending continuously about the pulleys andnot as a term of limitation. A single belt, as I use the term, denotesunitary belt means trained about the belt pulleys without a break and isinclusive of a plurality of parallel belts placed side by side andtrained about those pulleys.

Coil handling conveyor 69 is placed beneath mandrel 11 and serves toremove full-sized coils from mandrel 11 and convey them to other partsof the mill for further handling. Such means are well known and need notbe further described here.

A conventional strip guide 76 is placed above mandrel 11 and is arrangedto rest upon the extremity of one of the upper primary belt guidingframes. Strip is fed along the top of the guide from the mill and isthereby directed into the gap between the opposed upper belt guidingframes.

In operation, the two frames 12 are advanced toward empty mandrel 11 byoperation of hydraulic cylinders 27. Fluid pressure is applied tocylinder 64 thereby extending piston rod 66 and urging the primary beltguiding frames together as shown in FIGURE 2. When frames 12 areadvanced toward mandrel 11 the extremities of the lower primary beltguiding frames will nearly touch with the two belt pulleys 42 beingclosely adjacent. The upper belt guiding frames will be spaced slightlyapart, allowing a gap for entrance of strip material. Belts extendingbetween belt pulleys 42 and 31 will surround substantially the entiremandrel and coil formed thereon. When the mandrel is empty, the primarybelt guiding frames will assume the position shown fragmentarily inchain line in FIGURE 1. The belt extending between pulleys 31 and 42 oneach side will be deflected pulling each of the lower secondary beltguiding frames toward the mandrel and compressing springs 59.

Mandrel 11 is rotated, causing both belts 63 to be moved around theirrespective belt guiding pulleys due to frictional force between mandrel11 and the belts. A length of strip 1 is then fed along guide 70 andintroduced intermediate the extremities of the upper belt guiding framesforming a coil 2 on mandrel 11. As the end of strip is fed into the gapbetween the upper primary strip guiding frames, the belts will confineit around substantially the entire circumference of the mandrel andcause it to be carried around the circumference of mandrel 11 as themandrel rotates. As the leading end of the strip completes virtually anentire revolution, it will be directed further around the circumferenceof the mandrel by the confining forces of the belt and will be cinchedbeneath the second layer of strip being wound upon the mandrel. Duringsuccessive revolutions of mandrel 11, the strip will be held in place bythe confining force of the belts until, after several wraps, there issufficient frictional force developed by the back tension of the stripto hold the strip firmly in place on the mandrel. The belt wrapper,however, is left in applied position while the strip is wound. As thecoil grows, it will force the primary belt guiding frames away from themandrel, compressing piston rod 66 into cylinder 64 against the fluidpressure.

The lower primary belt guiding frames will tend to pivot about crossbars40 and their extremities will describe an are about the axis of crossbar40. If crossbars 40 were in fixed position, belt pulleys 42 would beclose together when a coil of intermediate diameter was formed, andthere would be an appreciable gap at other times. The end of each lowerprimary belt guiding frame away from the mandrel will, however,necessarily pivot about pivot point 49 by virtue of link 47. This movescrossbar 40 slightly away from the coiling axis when a coil has grown tointermediate diameter and then moves crossbar 4%) back toward thecoiling axis as the coil further enlarges. Crossbar 40 and pivot point49 are at substantially the same elevation, and the result is that theextremity of each lower primary belt guiding frame moves in asubstantially straight line radial motion with respect to the coilingaxis. There is, accordingly, a gap of minimum size between theextremities of the lower primary belt guiding frames at all degrees ofexpansion of the coil.

The belt wrapper is maintained in applied position while the coil isbeing wound. As one length of strip ends, it will be wound upon thecoil, and the entire coil is held snubbed against uncoiling. The nextsucceeding length of strip is then fed along guide 70 into the gapbetween the belts at the upper point and ceiling is resumed as before.As the coil expands, the primary belt guiding frames are forced awayfrom the mandrel by the growing coil on the mandrel. The circumferenceand amount of belt required to confine the coil likewise increases. Theupper secondary belt guiding frames are caused to move toward themandrel as the upper primary belt guiding frames move away from themandrel, thus reducing the amount of belt required to pass around thepulleys on the upper secondary belt guiding frames and supplying thenecessary belt to go around the circumference of the growing coil.Springs 59 supply a belt tensioning force at all times.

After a coil of full size has been formed as described, it is banded inthe usual fashion to prevent it from expanding and cylinders 27 areoperated to move frames 12 away from the mandrel 11. The pressure incylinder 64 may be reversed to hold the primary belt guiding frames inopen position until the belt wrapper has been withdrawn completely fromthe area of the coil. The mandrel is collapsed to a smaller diameter,coil conveyor 69 is raised to support the coil, and the coil is thenremoved axially from the mandrel. The mandrel is then re-expanded andframes 12 are moved toward mandrel lll. Fluid under pressure is suppliedto cylinder 64 to urge the primary belt guiding frames together, and theprocess is repeated as before. In this manner, a number of successivelengths of strip may be readily and expeditiously coiled without thenecessity of welding them end to end. The process is performed quicklyand with a minimum of difiiculty in handling the successive lengths ofstrip.

While I have illustrated and described a present preferred embodiment ofmy invention and have shown a present preferred method of practicing thesame, it is to be distinctly understood that the invention is notlimited thereto but may be otherwise variously embodied and practicedwithin the scope of the following claims.

I claim:

1. A belt wrapper comprising a pair of opposed support members disposedon opposite sides of a coiling axis, each support member having a pairof primary belt guiding frames movably mounted in the support member, apair of secondary belt guiding frames movably mounted in each supportmember, a single belt trained about all the belt guiding frames on eachsupport member, belt tension means, and means urging the primary beltguiding frames together and abutting a coil being formed about thecoiling axis.

2. A belt wrapper comprising a pair of opposed support members disposedon opposite sides of a mandrel forming a coiling axis for srip-likematerial, each support member having a pair of primary belt guidingframes supported thereby and arranged for movement toward and away fromthe mandrel, a pair of secondary belt guiding frames mounted incooperative relationship with said primary belt guiding frames, beltguiding pulleys on said frames, a single belt trained about the pulleyson all of said frames, means operable to urge the primary belt guidingframes toward the mandrel, and means urging the secondary belt guidingframes away from the mandrel, whereby the belt is maintained in tension.

3. A belt Wrapper comprising a pair of opposed support members disposedon opposite sides of a mandrel forming a coiling axis, each supportmember having a pair of primary belt guiding frames supported therebywith one of the frames above the coiling axis and the other frame belowthe coiling axis and arranged for movement of the frames toward and awayfrom the mandrel, a pair of secondary belt guiding frames movablymounted on each said support member, belt guiding pulleys on saidframes, a single belt trained about the pulleys on said frames, meansoperable to urge the primary belt guiding frames toward the mandrel,means interconnecting one of the primary belt guiding frames and one ofthe secondary belt guiding frames for movement of the secondary beltguiding frame oppositely to movement of the associated primary framewith respect to the mandrel, and means urging the other secondary beltguiding frame away from the mandrel, thereby maintaining the belt intension.

4. A belt wrapper comprising a pair of opposed support members disposedon opposite sides of a mandrel forming a coiling axis, each supportmember having a first primary belt guiding frame pivotally mountedtherein for movement toward and away from the mandrel, a second primarybelt guiding frame supported from the support member for movement towardand away from the mandrel on the opposite side of the coiling axis fromthe first primary belt guiding frame, a first secondary belt glidingframe pivotally mounted in the support member adjacent the first primarybelt guiding frame, means connecting the first primary belt guidingframe and the first secondary belt guiding frame for movement of thefirst secondary belt guiding frame relative to the mandrel oppositely tosuch movement of the first primary belt guiding frame, a secondsecondary belt guiding frame supported from the support member on theopposite side of the coiling axis from the first secondary belt guidingframe, pulleys on said frames, a single belt trained about the pulleyson said frames, means urging the secondary belt guiding frame outwardlyto maintain the belt in tension, and means selectively operable to urgethe primary belt guiding frames toward and away from the coiling axls.

5. A belt wrapper comprising a pair of opposed support members disposedon opposite sides of a mandrel forming a coiling axis for strip-likematerial, each support member having a pair of primary belt guidingframes supported thereby and arranged for movement toward and away fromthe mandrel, a pair of secondary belt guiding frames, belt guidingpulleys on said frames, a single belt trained about the pulleys on allof said frames, means operable to urge the primary belt guiding framestoward the mandrel, means urging the secondary belt guiding frames awayfrom the mandrel, whereby the belt is maintained in tension, and powermeans connected to the support members for movement of the supportmembers toward and away from the coiling axis.

6. A belt wrapper comprising a pair of opposed support members disposedon opposite sides of a mandrel forming a coiling axis, each supportmember having a pair of primary belt guiding frames supported therebywith one of the frames above the coiling axis and the other frame belowthe coiling axis and arranged for movement of the frames toward and awayfrom the mandrel, a pair of secondary belt guiding frames, belt guidingpulleys on said frames, a single belt trained about the pulleys on saidframes, fluid power means selectively operable to urge the primary beltguiding frames toward the mandrel and away from the mandrel, meansinterconnecting one of the primary belt guiding frames and one of thesecondary belt guiding frames for movement of the secondary belt guidingframe oppositely to movement of the associated primary frame withrespect to the mandrel, means urging the other secondary belt guidingframe away from the mandrel, thereby maintaining the belt in tension,and position shifting means connected to the support members formovement of the support members toward and away from the coiling axis.

7. Belt wrapper apparatus comprising a support member arranged forplacement adjacent a mandrel forming a coiling axis for strip-likematerial, a first primary belt guiding frame supported from the supportmember for movement toward and away from the mandrel, a second primarybelt guiding frame supported from the support member by link means formovement toward and away from the mandrel on the opposite side of thecoiling axis from the first primary belt guiding frame, a firstsecondary belt gliding frame supported from the support member andarranged for movement toward and away from the mandrel oppositely to thefirst primary belt guiding frame, a second secondary belt guiding framesupported from the support member and arranged for movement toward andaway from the mandrel, a single belt trained about all of the beltguiding frames, means urging the second secondary belt guiding frameoutwardly, whereby the belt is maintained in tension, and meansselectively operable to urge the primary belt guiding framesconcurrently toward and away from the mandrel.

8. Belt wrapper apparatus comprising a support member arranged forplacement adjacent a mandrel forming a coiling axis for strip-likematerial, a first primary belt guiding frame pivotally supported fromthe support member for pivotal movement toward and away from themandrel, a second primary belt guiding frame supported from the supportmember for movement toward and away from the mandrel on the oppositeside of the coiling axis from the first primary belt guiding frame, afirst secondary belt guiding frame supported from the support member andarranged for movement toward and away from the mandrel oppositely to thefirst primary belt guiding frame, a second secondary belt guiding framesupported from the support member and arranged for movement toward andaway from the mandrel, belt pulley means at the extremities of the beltguiding frames, a single belt trained around the belt pulley means,means urging the second secondary belt guiding frame outwardly, wherebythe belt is maintained in tension, and fluid pressure means selectivelyoperable to urge the primary belt guiding frames concurrently toward oraway from the mandrel.

9. Belt wrapper apparatus comprising a support member arranged forplacement adjacent a mandrel forming a coiling axis for strip-likematerial, a first primary belt guiding frame pivotally supported fromthe support member for movement toward and away from the mandrel, asecond primary belt guiding frame, first link means, pivotally connectedto one end of the second primary belt guiding frame and to the supportmember, second link means pivotally connected to a midpoint of thesecond primary belt guiding frame and to the support member, the otherend of the second primary belt guiding frame being thereby arranged formovement toward and away from the mandrel on the opposite side of thecoiling axis from the first primary belt guiding frame, a firstsecondary belt guiding frame associated with one of the primary beltguiding frames and connected thereto for movement toward and away fromthe mandrel oppositely to such movement of the associated primary beltguiding frame, a second secondary belt guiding frame supported from thesupport member and arranged for movement toward and away from themandrel, a single belt trained about all said belt guiding frames, belttension means and fluid pressure means concurrently urging both theprimary belt guiding frames selectively toward and away from themandrel.

10. Belt wrapper apparatus comprising a support member arranged forplacement adjacent a mandrel forming a coiling axis for strip-likematerial, a first primary belt guiding frame pivotally supported fromthe support member for pivotal movement toward and away from the uppersurface of the mandrel, a second primary belt guiding frame, first linkmeans pivotally connected to one end of the second primary belt guidingframe and to the support member, second link means pivotally connectedto a midpoint of the second primary belt guiding frame and to thesupport member, the second primary belt guiding frame being therebysupported for substantially linear movement of its extremity toward andaway from the lower surface of said mandrel, a first secondary beltguiding frame pivotally mounted in the support member adjacent the firstprimary belt guiding frame for movement toward and away from themandrel, means connecting the first primary belt guiding frame and thefirst secondary belt guiding frame for movement of one of said framestoward and away from the mandrel oppositely to such movement of theother said frame, a second secondary belt guiding frame pivotallymounted on the second link means, belt pulley means mounted in theprojecting extremities of all said belt guiding frames, a single belttrained about all said pulley means, and means urging second secondarybelt guiding frame downwardly away from the mandrel, thereby maintainingthe belt in tension.

11. The method of forming discrete pieces of strip-like material ofrandom length into a coil formed on a mandrel which comprisessurrounding the empty mandrel with flexible confining means which engagethe face of the mandrel around substantially its entire circumference,feeding the lengths of strip-like material successively through a gap inthe confining means, rotating the mandrel to build up a coil, andmaintaining the confining means against an increasingly longer outersurface of the coil around substantially its entire circumference untila complete coil is formed whose diameter is at least several times thediameter of the mandrel.

12 The method of winding discontinuous lengths of strip-like material ofrandom length to form a unitary tightly wound coil which comprisesplacing flexible strip confining means which engage the face of themandrel in contact with the mandrel around substantially its entirecircumference, rotating the mandrel, feeding the lengths of strip-likematerial successively through a gap in the confining means, therebywinding the lengths upon the mandrel and forming a coil between themandrel and the confining means, and maintaining the confining means incontact with the outer surface of the coil around substantially itsentire circumference until a full coil is formed whose diameter is atleast several times the diameter of the mandrel.

13. Belt wrapping apparatus for coiling sheet material on a mandrelwhich rotates about a fixed axis during the coiling operation, saidapparatus comprising a base; two housings mounted on said base atpositions angularly spaced around said mandrel for movement toward saidmandrel to coiling positions and away from said mandrel to noncoilingpositions; a separate endless belt carried by each of said housings; apair of rotatable belt supporting rollers carried by each of saidhousings; movable means supporting such rollers from each housing forrotation about axes substantially parallel to the mandrel axis so thatsaid rollers are located at positions angularly spaced around saidmandrel when the housing is in its coiling position; resilient means forurging said rollers toward said mandrel and toward each other duringcoiling of sheet material on said mandrel to cause said belt to contactthe coil on the mandrel throughout the coiling operation by a beltlength which increases during said coiling opera tion; said resilientmeans permitting said rollers to be moved apart as the size of the coilincreases; and means independent of movement of said housings forcompensating for changes in the belt length in contact with said coiland for maintaining substantial tension in the belts during the coilingoperation as the size of the coil increases.

References Cited in the file of this patent UNITED STATES PATENTS789,707 Bellamy May 16, 1905 2,928,622 Herr Mar. 15, 1960 FOREIGNPATENTS 930,681 Germany July 21, 1955 546,126 Great Britain June 29,1942 759,332 Great Britain Oct. 17, 1956

1. A BELT WRAPPER COMPRISING A PAIR OF OPPOSED SUPPORT MEMBERS DISPOSEDON OPPOSITE SIDES OF A COILING AXIS, EACH SUPPORT MEMBER HAVING A PAIROF PRIMARY BELT GUIDING FRAMES MOVABLY MOUNTED IN THE SUPPORT MEMBER, APAIR OF SECONDARY BELT GUIDING FRAMES MOVABLY MOUNTED IN EACH SUPPORTMEMBER, A SINGLE BELT TRAINED ABOUT ALL THE BELT GUIDING FRAMES ON EACHSUPPORT MEMBER, BELT TENSION MEANS, AND MEANS URGING THE PRIMARY BELTGUIDING FRAMES TOGETHER AND ABUTTING A COIL BEING FORMED ABOUT THECOILING AXIS.